What rations form a proportion ?

3/4 and 9/16

1/6 and 3/9

2/3 and 8/12

2/5 and 5/2

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy